Radar module incorporated with a pattern-shaping device

ABSTRACT

A radar module includes a printed circuit board (PCB) and a semiconductor package mounted on the PCB. The semiconductor package comprises an integrated circuit die and a substrate for electrically connecting the integrated circuit die to the PCB. The substrate comprises an antenna layer integrated into the semiconductor package and electrically connected to the integrated circuit die for at least one of transmitting and receiving radar signals. A discrete pattern-shaping device is mounted on the PCB and is configured to shape a radiation pattern of the radar signals.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority from U.S. provisional application No. 62/577,745 filed Oct. 27, 2017 and U.S. provisional application No. 62/596,152 filed Dec. 8, 2017, the subject matter of which is hereby incorporated by reference.

BACKGROUND

This disclosure relates generally to the field of a radar module and, more particularly, to a radar module incorporated with a pattern-shaping device.

As known in the art, a radar module such as a millimeter-wave (mmW) radar module for automotive applications typically includes an Antenna-in-Package (AiP) with an antenna assembly having a specific radiation pattern.

Sometimes, the radiation pattern of the fabricated AiP of a radar module may need to be shaped to meet another customer's gain pattern specification. However, once the AiP is fabricated, the radiation pattern thereof is fixed, and basically there is no way to adjust it except that the antenna assembly is redesigned.

This is undesirable because redesigning the antenna assembly is usually time-consuming and is also costly.

SUMMARY

The main object of the present invention is to provide a radar module incorporated with a pattern-shaping device to overcome the deficiencies and disadvantages of the prior art.

According to one aspect of the invention, a radar module includes a printed circuit board (PCB) having a first surface and a second surface opposite to the first surface. A semiconductor package is mounted on the PCB. The semiconductor package comprises an integrated circuit die and a substrate for electrically connecting the integrated circuit die to the PCB. The substrate comprises an antenna layer integrated into the semiconductor package and electrically connected to the integrated circuit die for at least one of transmitting and receiving radar signals. A pattern-shaping device is mounted on the first surface of the PCB and is configured to shape a radiation pattern of the radar signals.

According to another aspect of the invention, a radar module includes a printed circuit board (PCB) having a first surface and a second surface opposite to the first surface. A semiconductor package is mounted on the PCB. The semiconductor package comprises an integrated circuit die and a substrate for electrically connecting the integrated circuit die to the PCB. The substrate comprises an antenna layer integrated into the semiconductor package and electrically connected to the integrated circuit die for at least one of transmitting and receiving radar signals. A radar main body is provided to house the PCB and the semiconductor package. The radar main body may comprise a retainer. A pattern-shaping device is mounted on the retainer and is configured to shape a radiation pattern of the radar signals.

These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings:

FIG. 1 is a perspective diagram of an exemplary radar module according to one embodiment of the invention;

FIG. 2 is a top view of the exemplary radar module in FIG. 1;

FIG. 3 is a schematic, cross-sectional view taken along line I-I′ in FIG. 2;

FIG. 4 is a schematic, cross-sectional view taken along line II-II′ in FIG. 2;

FIG. 5 to FIG. 12 are schematic, perspective diagrams showing various pattern-shaping devices according to various embodiments of the invention; and

FIG. 13 to FIG. 16 are schematic, cross-sectional diagrams showing some exemplary radar modules with various shapes of the pattern-shaping device according to other embodiments of the invention.

DETAILED DESCRIPTION

In the following detailed description of the invention, reference is made to the accompanying drawings which form a part hereof, and in which is shown, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments may be utilized and structural, logical, and electrical changes may be made without departing from the scope of the present invention.

The terms “die”, “chip”, “semiconductor chip”, and “semiconductor die” are used interchangeable throughout the specification to mean integrated circuit chip or die. The term “horizontal” as used herein may be defined as a direction parallel to a plane or surface (e.g., surface of a substrate or a stage), regardless of its orientation. The term “vertical,” as used herein, may refer to a direction orthogonal to the horizontal direction as just described. Terms, such as “on,” “above,” “below,” “bottom,” “top,” “side” (as in “sidewall”), “higher,” “lower,” “upper,” “over,” and “under,” may be referenced with respect to the horizontal plane.

The present disclosure pertains to a radar module incorporated with a discrete pattern-shaping device, which is capable of providing benefits including, but not limited to, narrower beam width and higher gain. By incorporating various pattern-shaping structures, the customer's gain pattern specification can be met without the need of redesigning the antenna assembly of the Antenna-in-Package (AiP).

Please refer to FIG. 1 to FIG. 4. FIG. 1 is a perspective diagram of an exemplary radar module according to one embodiment of the invention. FIG. 2 is a top view of the exemplary radar module in FIG. 1. FIG. 3 is a schematic, cross-sectional view taken along line I-I′ in FIG. 2. FIG. 4 is a schematic, cross-sectional view taken along line II-II′ in FIG. 2.

As shown in FIG. 1 to FIG. 4, the radar module M comprises a printed circuit board (PCB) 100 having a first surface 100 a and a second surface 100 b opposite to the first surface 100 a. A semiconductor package 1 is mounted on the first surface 100 a of the PCB 100. For the sake of simplicity, the wiring layers and interconnect elements in the printed circuit board 100 is not explicitly shown. It is understood that the PCB 100 may comprise a core layer or core substrate such as a copper clad laminate and a plurality of wiring layers and insulating layers laminated on the core layer. On the first surface 100 a and the second surface 100 b, solder masks (not explicitly shown) may be provided to protect the upper metal layer. Solder pads may be exposed by the solder pad openings formed in the solder mask for the connection with the semiconductor package 1 mounted on the first surface 100 a.

According to one embodiment, the semiconductor package 1 may be an Antenna-in-Package (AiP), but is not limited thereto. As can be seen in FIG. 2 and FIG. 3, according to one embodiment of the invention, the semiconductor package 1 may comprise a substrate 10, an integrated circuit die 20 such as a radio frequency (RF) die disposed on the substrate 10, a molding compound 30 that is disposed on the substrate 10 and encapsulates the integrated circuit die 20, and a plurality of solder balls 50 disposed on a bottom surface of the substrate 10.

According to one embodiment of the invention, the substrate 10 may comprise an antenna layer 110, a ground reflector layer 120 under the antenna layer 110, and an insulating layer 130 between the antenna layer 110 and the ground reflector layer 120. The substrate 10 may further comprise a plurality of ball pads 122 for attaching the solder balls 50. According to one embodiment of the invention, the ball pads 122 and the ground reflector layer 120 are coplanar and are formed in the same metal layer of the substrate 10.

According to one embodiment of the invention, the antenna layer 110 and the ground reflector layer 120 are formed in two different metal layers (e.g., copper layers) of the substrate 10. The two metal layers are in different horizontal planes. For example, the substrate 10 may comprise an upper surface that is closer to the integrated circuit die 20 and a lower surface opposite to the upper surface. The antenna layer 110 may be formed at the upper surface and is therefore closer to the integrated circuit die 20. The antenna layer 110 may be electrically connected to the integrated circuit die 20 through an interconnect or a trace 112. The ground reflector layer 120, which may be electrically connected to a ground plane of the PCB 100, may be formed at the lower surface and is therefore closer to the PCB 100. Although not shown in the figures, it is to be understood that the metal layers in the substrate 10 may be interconnected through conductive vias if necessary.

According to one embodiment of the invention, the antenna layer 110 may comprise two rectangular-shaped antenna patterns 110 a and 110 b. The antenna pattern 110 a is spaced apart from the antenna pattern 110 b. According to one embodiment of the invention, for example, both of the antenna pattern 110 a and the antenna pattern 110 b may have dimension of about (80 _(g)/2)×(λ_(g)/2), wherein λ_(g) is the guided wavelength of the electromagnetic radiation transmitted via the antenna layer 110, for example, a W-band radar, operating at 77 GHz, would have a λ_(g)=1.1˜1.3 mm, wherein the substrate dielectric constant (ε_(r)) is about 3.6. Only for illustration purposes, the antenna pattern (transmit antenna) 110 a may be used to transmit a send radar signal (T_(x)) and the antenna pattern (receive antenna) 110 b may be used to receive a reflected radar signal (R_(x)).

It is to be understood that the antenna layer 110 can be realized by any type of antenna structure. In the illustrated embodiment of this disclosure, a patch antenna is selected due to its high gain and broadside radiation characteristics. According to other embodiments of the invention, the antenna layer 110 may be a phased-array antenna, a dipole antenna, a slot antenna, etc. According to one embodiment of the invention, the ground reflector layer 120 may be a solid metal layer such as a solid copper layer, which completely overlaps with the antenna layer 110 when viewed from the above.

According to one embodiment of the invention, the integrated circuit die 20 may be an integrated circuit (IC) silicon die or a semiconductor chip that comprises relative functional circuits for transmitting and/or receiving radar or RF signals. According to one embodiment of the invention, the integrated circuit die 20 may have an active surface 20 a and a passive surface 20 b that is opposite to the active surface 20 a. A plurality of input/output (I/O) pads 210 may be disposed on the active surface 10 a. According to one embodiment of the invention, the active surface 10 a of the integrated circuit die 20 may be integrally joined with the upper surface of the substrate 10. The antenna layer 110 may be electrically connected to respective I/O pads 210 on the active surface 20 a of the integrated circuit die 20 through the interconnect or the trace 112.

According to one embodiment of the invention, the molding compound 30 may comprise organic resin typically used in the encapsulation of integrated circuit devices and selected for low moisture permeability and low thermal coefficient of expansion to avoid exposure of the encapsulated chip to moisture or mechanical stress, respectively. For example, according to one embodiment of the invention, the molding compound 30 may comprise epoxy materials. The molding compound 30 may further comprise fillers, such as amorphous silicon oxide (silica glass) and/or crystalline silicon oxide (quartz) fillers. Suitable additives may be added to enhance the thermal conductivity of the molding compound 30. According to one embodiment of the invention, the molding compound 30 may have a dielectric constant k ranging between 3.3 and 3.4, for example. According to one embodiment of the invention, the molding compound 30 may have a thickness of about 1.1˜1.3 mm, for example, 1.2 mm, but is not limited thereto.

According to one embodiment of the invention, for example, the semiconductor package 1 may be a fan-out wafer level package (FOWLP) and the substrate 10 may be a re-distribution layer (RDL) substrate. As known in the art, wafer level package (WLP) involves packaging the die while it is still on the wafer. Generally, WLP is a substrate-less package. Instead of a substrate, WLP utilizes a thin-film of routing layers, or redistribution layers (RDLs), which provide electrical connections in the package. WLP makes use of solder balls 50 on the bottom of the package, which connects the RDLs to a board or a printed circuit board (PCB).

According to one embodiment of the invention, the radar module M further comprises a discrete pattern-shaping device 2 is externally and directly mounted on the first surface 100 a of the PCB 100 and on a top surface 30 a of the molding compound 30 of the semiconductor package 1 by using an adhesive layer 210 or the like. According to one embodiment of the invention, the pattern-shaping device 2 is preferably a monolithic piece that is made of a homogeneous material. For example, the pattern-shaping device 2 may be made of metal, plastic, mmW absorber materials, or any suitable materials capable of implementing radiation pattern shaping of radar signals. According to one embodiment of the invention, the pattern-shaping device 2 may be made of copper, but is not limited thereto.

According to one embodiment of the invention, the pattern-shaping device 2 may comprise four sidewalls 201˜204 and an intermediate isolation wall 205, which together define two compartments or channels C_(a) and C_(b) above the semiconductor package 1. According to one embodiment of the invention, the channel C_(a) is aligned with the antenna pattern (transmit antenna) 110 a and the channel C_(b) is aligned with the antenna pattern (receive antenna) 110 b. In some embodiments, the intermediate isolation wall 205 is optional and may be omitted.

According to one embodiment of the invention, the two opposite sidewalls 201 and 202 are vertical sidewalls, which protrude and extend vertically from the first surface 100 a of the PCB 100. The two opposite sidewalls 201 and 202 are in parallel with the reference XZ plane. According to one embodiment of the invention, the two opposite sidewalls 201 and 202 are fixed to the first surface 100 a of the PCB 100 and have a height h₁ approximately ranging between 4 and 12 mm, but is not limited thereto.

The intermediate isolation wall 205 is in parallel with the sidewalls 201 and 202 and is interposed between the sidewalls 201 and 202. The intermediate isolation wall 205 partially overlaps with the underlying semiconductor package 1. According to one embodiment of the invention, the intermediate isolation wall 205 is a vertical wall, which protrudes and extends vertically from the top surface 30 a of the molding compound 30 of the semiconductor package 1. According to one embodiment of the invention, the intermediate isolation wall 205 has a height h₂ approximately ranging between 3 and 12 mm, which is not limited thereto, from the top surface 30 a of the molding compound 30.

According to one embodiment of the invention, the sidewall 203 is a vertical sidewall, which preferably protrudes and extends vertically from the top surface 30 a of the molding compound 30 of the semiconductor package 1. The sidewall 203 is in parallel with the reference YZ plane and is integrally connected to the sidewalls 201 and 202 and the intermediate isolation wall 205 at a right angle.

According to one embodiment of the invention, the sidewall 204, which is opposite to the sidewall 203, is an oblique sidewall. The oblique sidewall may be used to expand the field distribution of the antenna, making the field distribution more uniform. The sidewall 204 provides an inner slope 204 a directly facing the semiconductor package 1. The inner slope 204 a intersects with the first surface 100 a of the PCB 100 at an obtuse angle θ. According to one embodiment of the invention, the obtuse angle θ may range between 110 degrees and 160 degrees, depending upon the design requirements. The sidewall 204 is integrally connected to the sidewalls 201 and 202 and the intermediate isolation wall 205.

FIG. 5 is a schematic, perspective diagrams illustrating an exemplary radar module with a pattern-shaping device according to another embodiment of the invention, wherein like regions, layers or elements are designated by like numeral numbers. As shown in FIG. 5, the discrete pattern-shaping device 2 is externally and directly mounted on the first surface 100 a of the PCB 100 and on a top surface 30 a of the molding compound 30 of the semiconductor package 1. According to the illustrated embodiment, the pattern-shaping device 2 is preferably a monolithic piece that is made of a homogeneous material. For example, the pattern-shaping device 2 may be made of metal, plastic, mmW absorber materials, or any suitable materials capable of implementing radiation pattern shaping of radar signals. According to the illustrated embodiment, the pattern-shaping device 2 may be made of copper, but is not limited thereto. According to the illustrated embodiment, the pattern-shaping device 2 comprises four sidewalls 201˜204 and an intermediate isolation wall 205. According to the illustrated embodiment, the two opposite sidewalls 201 and 202 are vertical sidewalls, which protrude and extend vertically from the first surface 100 a of the PCB 100. The two opposite sidewalls 201 and 202 are in parallel with the reference XZ plane. The two opposite sidewalls 203 and 204 are vertical sidewalls. The sidewall 203 protrudes and extends vertically from the top surface 30 a of the molding compound 30 of the semiconductor package 1. The sidewall 204 protrudes and extends vertically from the first surface 100 a of the PCB 100. The sidewalls 203 and 204 are in parallel with the reference YZ plane and are integrally connected to the sidewalls 201 and 202 and the intermediate isolation wall 205 at a right angle. The opening 200 defined by the four vertical sidewalls 201˜204 completely overlaps with the antenna patterns in the antennal layer of the semiconductor package 1 when viewed from the above. It is to be understood that the pattern-shaping device 2 may be made of hybrid materials. For example, only two sidewalls are made of copper, while the rest sidewalls are made of absorber.

FIG. 6 is a schematic, perspective diagrams illustrating an exemplary radar module with a pattern-shaping device according to another embodiment of the invention, wherein like regions, layers or elements are designated by like numeral numbers. As shown in FIG. 6, the discrete pattern-shaping device 2 is externally and directly mounted on the first surface 100 a of the PCB 100 and on a top surface 30 a of the molding compound 30 of the semiconductor package 1. According to the illustrated embodiment, the pattern-shaping device 2 is preferably a monolithic piece that is made of a homogeneous material. For example, the pattern-shaping device 2 may be made of metal, plastic, mmW absorber materials, or any suitable materials capable of implementing radiation pattern shaping of radar signals. According to the illustrated embodiment, the pattern-shaping device 2 may be made of copper, but is not limited thereto. According to the illustrated embodiment, the pattern-shaping device 2 comprises only four sidewalls 201˜204. The intermediate isolation wall 205 as depicted in FIG. 1 and FIG. 2 is omitted. According to the illustrated embodiment, the two opposite sidewalls 201 and 202 are vertical sidewalls, which protrude and extend vertically from the first surface 100 a of the PCB 100. The two opposite sidewalls 201 and 202 are in parallel with the reference XZ plane. The two opposite sidewalls 203 and 204 are vertical sidewalls. The sidewall 203 protrudes and extends vertically from the top surface 30 a of the molding compound 30 of the semiconductor package 1. The sidewall 204 protrudes and extends vertically from the first surface 100 a of the PCB 100. The sidewalls 203 and 204 are in parallel with the reference YZ plane and are integrally connected to the sidewalls 201 and 202 at a right angle. The opening 200 defined by the four vertical sidewalls 201˜204 completely overlaps with the antenna patterns in the antennal layer of the semiconductor package 1 when viewed from the above.

FIG. 7 is a schematic, perspective diagrams illustrating an exemplary radar module with a pattern-shaping device according to another embodiment of the invention, wherein like regions, layers or elements are designated by like numeral numbers. As shown in FIG. 7, the discrete pattern-shaping device 2 is externally and directly mounted on the first surface 100 a of the PCB 100 and on the semiconductor package 1. According to the illustrated embodiment, the pattern-shaping device 2 is preferably a monolithic piece that is made of a homogeneous material. For example, the pattern-shaping device 2 may be made of metal, plastic, mmW absorber materials, or any suitable materials capable of implementing radiation pattern shaping of radar signals. According to the illustrated embodiment, the pattern-shaping device 2 may be made of copper, but is not limited thereto. According to the illustrated embodiment, the pattern-shaping device 2 comprises two sidewalls 203 and 204 and an intermediate isolation wall 205 integrally connecting to the two sidewalls 203 and 204 at t a right angle. According to the illustrated embodiment, the two opposite sidewalls 203 and 204 are vertical sidewalls. The sidewall 203 protrudes and extends vertically from the top surface 30 a of the molding compound 30 of the semiconductor package 1. The sidewall 204 protrudes and extends vertically from the first surface 100 a of the PCB 100. The sidewalls 203 and 204 are in parallel with the reference YZ plane. The two open-ended cubicles 200 a and 200 b defined by the vertical sidewalls 203 and 204 and the intermediate isolation wall 205 are aligned with the antenna patterns in the semiconductor package 1, respectively.

FIG. 8 is a schematic, perspective diagrams illustrating an exemplary radar module with a pattern-shaping device according to still another embodiment of the invention, wherein like regions, layers or elements are designated by like numeral numbers. As shown in FIG. 8, the discrete pattern-shaping device 2 is externally and directly mounted on the first surface 100 a of the PCB 100 and on the semiconductor package 1. According to the illustrated embodiment, the pattern-shaping device 2 is preferably made of a homogeneous material. For example, the pattern-shaping device 2 may be made of metal, plastic, mmW absorber materials, or any suitable materials capable of implementing radiation pattern shaping of radar signals. According to the illustrated embodiment, the pattern-shaping device 2 may be made of copper, but is not limited thereto. According to the illustrated embodiment, the pattern-shaping device 2 comprises only two sidewalls 203 and 204. According to the illustrated embodiment, the two opposite sidewalls 203 and 204 are vertical sidewalls. The sidewall 203 protrudes and extends vertically from the top surface 30 a of the molding compound 30 of the semiconductor package 1. The sidewall 204 protrudes and extends vertically from the first surface 100 a of the PCB 100. The sidewalls 203 and 204 are in parallel with the reference YZ plane.

FIG. 9 is a schematic, perspective diagrams illustrating an exemplary radar module with a pattern-shaping device according to still another embodiment of the invention, wherein like regions, layers or elements are designated by like numeral numbers. As shown in FIG. 9, the pattern-shaping device 2 comprises only two sidewalls 203 and 204. According to the illustrated embodiment, the sidewall 203 comprises a vertical sidewall 213 and an oblique sidewall 223 integrally connected to the vertical sidewall 213, and the sidewall 204 comprises a vertical sidewall 214 and an oblique sidewall 224 integrally connected to the vertical sidewall 214. The sidewall 213 protrudes and extends vertically from the top surface 30 a of the molding compound 30 of the semiconductor package 1. The sidewall 214 protrudes and extends vertically from the first surface 100 a of the PCB 100. The sidewalls 213 and 214 are in parallel with the reference YZ plane. The oblique sidewalls 223 and 224 may be used to expand the field distribution of the antenna, making the field distribution more uniform.

FIG. 10 is a schematic, perspective diagrams illustrating an exemplary radar module with a pattern-shaping device according to still another embodiment of the invention, wherein like regions, layers or elements are designated by like numeral numbers. As shown in FIG. 10, the discrete pattern-shaping device 2 is externally and directly mounted on the first surface 100 a of the PCB 100 and on the semiconductor package 1. The discrete pattern-shaping device 2 in FIG. 10 is similar to that as depicted in FIG. 7. The difference between the discrete pattern-shaping device 2 in FIG. 10 and the discrete pattern-shaping device 2 in FIG. 7 is that the discrete pattern-shaping device 2 in FIG. 10 includes a ceiling 206. The two sidewalls 203 and 204 and the intermediate isolation wall 205 integrally connecting to the two sidewalls 203 and 204 at t a right angle form two opposite openings 200 c and 200 d oriented along the reference Y axis.

FIG. 11 is a schematic, perspective diagrams illustrating an exemplary radar module with a pattern-shaping device according to still another embodiment of the invention, wherein like regions, layers or elements are designated by like numeral numbers. As shown in FIG. 11, the discrete pattern-shaping device 2 is externally and directly mounted on the first surface 100 a of the PCB 100 and on the semiconductor package 1. The discrete pattern-shaping device 2 in FIG. 11 is similar to that as depicted in FIG. 10. The difference between the discrete pattern-shaping device 2 in FIG. 10 and the discrete pattern-shaping device 2 in FIG. 10 is that the discrete pattern-shaping device 2 in FIG. 11 has two parallel openings 200 e and 200 f oriented along the reference X axis. The two parallel openings 200 e and 200 f are defined by the sidewalls 201, 202, 203, the intermediate isolation wall 205, and the ceiling 206.

FIG. 12 is a schematic, perspective diagrams illustrating an exemplary radar module with a pattern-shaping device according to yet another embodiment of the invention, wherein like regions, layers or elements are designated by like numeral numbers. As shown in FIG. 12, the discrete pattern-shaping device 2 is externally and directly mounted on the first surface 100 a of the PCB 100 and on the semiconductor package 1. The discrete pattern-shaping device 2 in FIG. 12 is similar to that as depicted in FIG. 11. The difference between the discrete pattern-shaping device 2 in FIG. 12 and the discrete pattern-shaping device 2 in FIG. 11 is that the discrete pattern-shaping device 2 in FIG. 12 has two parallel, elevated openings 200 g and 200 h oriented along the reference X axis. The two parallel, elevated openings 200 g and 200 h are defined by the sidewalls 201, 202, 203, the intermediate isolation wall 205, the sidewall 204 a, and the ceiling 206. The sidewall 204 a has a smaller height, as shown in FIG. 12.

Please refer to FIG. 13 to FIG. 16. FIG. 13 to FIG. 16 are schematic, cross-sectional diagrams illustrating some exemplary radar modules with various shapes of the pattern-shaping device according to other embodiments of the invention, wherein like regions, layers or elements are designated by like numeral numbers.

As shown in FIG. 13 to FIG. 16, the radar module M may further comprise a radar main body 4 housing the PCB 100 and the semiconductor package 20 that is mounted on the PCB 100. The details of the PCB 100 and the semiconductor package 20 are disclosed as alluded to above. According to one embodiment of the invention, the radar main body 4 may have a transmission surface or a reception surface 4 a provided at one surface of the body 4 to transmit or receive radio waves or radar signals. For example, the radar main body 4 may comprise a retainer 41 at the surface 4 a. A pattern-shaping device 2 a having sidewalls with a triangle sectional profile may be mounted on the retainer 41. For example, FIG. 13 shows that the pattern-shaping device 2 a may have a sectional profile with an equilateral or isosceles triangle shape. For example, FIG. 14 and FIG. 15 show that the pattern-shaping device 2 a may have a sectional profile with a right-angled triangle shape. For example, FIG. 16 shows that the pattern-shaping device 2 a may have a sectional profile with a trapezoid shape.

Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims. 

What is claimed is:
 1. A radar module, comprising: a printed circuit board (PCB) having a first surface and a second surface opposite to the first surface; a semiconductor package mounted on the first surface of the PCB, wherein the semiconductor package comprises an integrated circuit die and a substrate for electrically connecting the integrated circuit die to the PCB, wherein the substrate comprises an antenna layer integrated into the semiconductor package and electrically connected to the integrated circuit die for at least one of transmitting and receiving radar signals; and a pattern-shaping device mounted on the first surface of the PCB configured to shape a radiation pattern of said radar signals, wherein the pattern-shaping device comprises a first protrusion and a second protrusion, wherein at least a portion of the integrated circuit die is between the first and second protrusions or below an area between the first and second protrusions.
 2. The radar module according to claim 1, wherein the semiconductor package further comprises a molding compound encapsulating the integrated circuit die.
 3. The radar module according to claim 2, wherein the pattern-shaping device is a discrete device directly mounted on the first surface of the PCB and a top surface of the molding compound of the semiconductor package.
 4. The radar module according to claim 1, wherein the pattern-shaping device is a monolithic piece that is made of a homogeneous material.
 5. The radar module according to claim 1, wherein the pattern-shaping device is made of metal, plastic or mmW absorber material.
 6. The radar module according to claim 1, wherein the substrate further comprises a ground reflector layer under the antenna layer.
 7. The radar module according to claim 6, wherein the ground reflector layer is a metal layer.
 8. The radar module according to claim 1, wherein the pattern-shaping device comprises four sidewalls and an intermediate isolation wall, which together define two channels above the semiconductor package, wherein the two channels are aligned with two antenna patterns of the antenna layer, respectively, wherein the first and second protrusions are two of the four sidewalls.
 9. The radar module according to claim 8, wherein the four sidewalls comprise an oblique sidewall.
 10. The radar module according to claim 9, wherein the oblique sidewall provides an inner slope directly facing the semiconductor package, wherein the inner slope intersects with the first surface of the PCB at an obtuse angle θ ranging between 110 degrees and 160 degrees.
 11. A radar module, comprising: a printed circuit board (PCB) having a first surface and a second surface opposite to the first surface; a semiconductor package mounted on the first surface of the PCB, wherein the semiconductor package comprises an integrated circuit die and a substrate for electrically connecting the integrated circuit die to the PCB, wherein the substrate comprises an antenna layer integrated into the semiconductor package and electrically connected to the integrated circuit die for at least one of transmitting and receiving radar signals; a radar main body housing the PCB and the semiconductor package, the radar main body comprising a retainer; and a pattern-shaping device mounted on the retainer configured to shape a radiation pattern of said radar signals, wherein the pattern-shaping device comprises a first protrusion and a second protrusion, wherein at least a portion of the integrated circuit die is between the first and second protrusions or below an area between the first and second protrusions.
 12. The radar module according to claim 11, wherein the pattern-shaping device is a monolithic piece that is made of a homogeneous material.
 13. The radar module according to claim 11, wherein the pattern-shaping device is made of metal, plastic or mmW absorber material.
 14. The radar module according to claim 11, wherein the first protrusion has a sectional profile of equilateral shape, isosceles triangle shape, right-angled triangle shape or trapezoid shape.
 15. The radar module according to claim 1, wherein the pattern-shaping device comprises a third protrusion between the first and second protrusions, the third protrusion being an intermediate isolation wall. 